Refer to the exhibit. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco broadband router?

The command marked with an arrow in the exhibit is:

access-list 102 permit ip 10.10.10.0 0.0.0.255 any

In the context of the configuration output for a Cisco router, this command serves as an access control list (ACL) rule. The purpose of this specific command is to define which addresses can be translated using Network Address Translation (NAT).

Here’s a breakdown of the command:

• access-list 102: This specifies the ACL number 102.
• permit: This action allows the traffic to pass through the router.
• ip: This indicates that the rule applies to IP traffic.
• 10.10.10.0 0.0.0.255: This specifies the source network as 10.10.10.0 with a subnet mask of 0.0.0.255, which corresponds to the range of IP addresses from 10.10.10.0 to 10.10.10.255.
• any: This means the rule applies to traffic going to any destination.

This ACL is then referenced by the NAT configuration line:

ip nat inside source list 102 interface fastethernet 0/1 overload

This line tells the router to perform NAT for any IP addresses on the inside network that match the ACL 102, translating them to the IP address assigned to the FastEthernet 0/1 interface, and to use PAT (Port Address Translation) to allow multiple inside addresses to share the single outside IP address, indicated by the overload keyword.